linux-imx

/*

 * Interface to Linux block layer for MTD 'translation layers'.

 *

 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

​

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/list.h>

#include <linux/fs.h>

#include <linux/mtd/blktrans.h>

#include <linux/mtd/mtd.h>

#include <linux/blkdev.h>

#include <linux/blk-mq.h>

#include <linux/blkpg.h>

#include <linux/spinlock.h>

#include <linux/hdreg.h>

#include <linux/mutex.h>

#include <linux/uaccess.h>

​

#include "mtdcore.h"

​

static LIST_HEAD(blktrans_majors);

static DEFINE_MUTEX(blktrans_ref_mutex);

​

static void blktrans_dev_release(struct kref *kref)

{

    struct mtd_blktrans_dev *dev =

        container_of(kref, struct mtd_blktrans_dev, ref);

​

    dev->disk->private_data = NULL;

    blk_cleanup_queue(dev->rq);

    blk_mq_free_tag_set(dev->tag_set);

    kfree(dev->tag_set);

    put_disk(dev->disk);

    list_del(&dev->list);

    kfree(dev);

}

​

static struct mtd_blktrans_dev *blktrans_dev_get(struct gendisk *disk)

{

    struct mtd_blktrans_dev *dev;

​

    mutex_lock(&blktrans_ref_mutex);

    dev = disk->private_data;

​

    if (!dev)